A rocky Irish outcropping with a history of wealth, conflict, and ruin.

This controversial Irish show cave is home to a massive formation known as the Great Stalactite.

A stunning Victorian abbey and walled garden on a lakefront.

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

The somber sculptures commemorating Irish Famine on the river Liffey in Dublin.

This floating garden in the sky is straight out of a fairy tale, but the real thing is nothing short of magical.

An Irish church where an 800-year-old mummy is reaching out of his coffin as if to shake hands.

A men’s restroom became a sandwich shop.

The final resting place of the "father of special effects."

With a history of slaughter, feast, and famine, remnants of the pork industry decorate this area--even its church.

Remains of Roman amphitheater hidden in a sleepy quarter of Paris.

A favorite Paris bar for U.S. expats, including Gershwin, Hemingway, and James Bond.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

One of only two commuter aerial tramways in the United States.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

This isolated and westernmost point of the Faroe Islands archipelago is home to thousands of seabirds.

Located more than 600 feet beneath sea level, this tunnel boasts the world's first undersea roundabout.

The abandoned village of Skarð aptly illustrates the idiom "Don't put all your eggs in one basket."

This remote island village was in danger of depopulating completely until a tunnel was built to connect it to the rest of the world .

The largest lake in the Faroe Islands seems to be held hundreds of feet above sea level thanks to an optical illusion.

This interactive gallery makes you feel like you've stepped into a fantasy world filled with whimsical monsters.

The oldest house in Manhattan is now a museum that remembers the home's sordid history of scandals, vice-presidents, and ghosts.